Front dump mine skip



2 Sheets-Sheet 1' Inventor DAN/EL c. LEONARD D. c. LEONARD FRONT DUMPM'INE SKIP FIG. 2

March 25, 1958 Filed Aug; 10,1956

FIG l March 1958 I D. c. LEONARD 2,828,041

FRONT DUMP MINE SKIP Filed Aug. 0, 195 2 Sheets-Sheet2 FIG; 3

FIG. 5

FIG. 6

lnvz-ntor DAN/EL C. LEONARD FRDNT DUMP MINE SKIP Daniel C. Leonard,(lriilia, Ontario, Canada, assignor to Dorr-flliver-Long Limited, acompany of Canada Appiication August 10, 1956, Serial No. 603,283-

4 Claims. (Cl. 214741) This invention relates to a skip for removingmuck and the like from mines, of the type that are drawn up the mineshaft on guide runners mounted in the latter. More particularly, theinvention relates to the dumping of the skip.

Many arrangements have been employed in the past for dumping skips. Ifeel, however, that the front dump arrangement that I have devised is asubstantial improvement over those that have gone before from the pointof View of reliability in operation, ruggedness of construction, andadaptability to the job to be done.

Generally speaking, my skip is a front dump skip, that is, the openingthrough which the load is released is one in a front wall of the skip.The opening is adjacent the bottom, and the bottom of the skip is slopedtowards the opening to promote easy dumping. The advantage in my frontdump arrangement over those of the prior art resides in the actuallocation of the opening with respect to the side walls and the means forfirst releasing the latch on the door for the opening, and subsequentlyapplying power to open the door.

My invention will be clearly understood after reference to the followingdetailed specification read in conjunction with the drawings.

In the drawings:

Figure 1 is a side elevation of a skip according to my invention showingin dotted lines the position of the door in the open position.

Figure 2 is a front elevation of Figure 1.

Figure 3 is a sectional View along the line 3-3 of Figure 1.

Figure 4 is a sectional view along the line 4-4 of Figure 3.

Figure 5 is a view along the line 5--5 of Figure 1; and

Figure 6 is a fragmentary vertical section taken through the skipadjacent the bottom thereof to illustrate the liners employed in theskip construction.

The skip illustrated in the drawings is open at its top end, as skipsusually are, and has vertical side walls which include a back wall 10,similar side walls 11, and a front wall 12. The bottom 13 slopesdownwardly from the back wall 10 towards the front wall 12.

The discharge opening in the skip illustrated is formed in the frontwall 12 adjacent the bottom 13, and is provided with a door 14 hingedabout an axis at the upper end of the opening as at to open and closethe opening.

The actual construction of the body of the skip has not been describedin detail since the construction is capable of great variation, is wellknown in the art, and is not being claimed in this specification.

The bottom of skip 13 is formed with a liner 16, the lower end of whichabuts with the door 14 when the door is in closed position, whereby theactual discharge opening for the skip slopes inwardly of the front wall12 from its top towards its bottom. It should perhaps be also mentionedthat side walls 11 each have a vertically extending liner that abutswith the door 14 when the door nited States Patent" 0 t ce is in aclosed position. sloping opening which is defined by the edges of theside" wall and bottom liners that engage with the door 14 is indicatedin Figure 6, which is a view of the opening with the door removed. Thevertical liners just referred to are indicated by numeral 17. It will benoted that the lower portion of the bottom 13 of the skip is continuedpast the opening so that it, in effect, forms an apron incliningdownwardly from the opening over which discharge from the skip willflow.

The door 14 comprises two channel members 18 and 19, one arm of which isextended by means of plates 20 and 21. The door panel is secured to thefree end of plates 20 and El. by means of welding or some other suitablemeans. Plate Zti is deeper at its bottom than at its top to permit thedoor panel 14 to engage with the edges of liners l6 and 17 that definethe inwardly sloping opening. It will be noted that the groove of thechannels 18 and 1% cooperate with the outer side Walls 11 of the skipbody.

The door 14 is normally locked in a closed position by means of thelatch 22 that is carried thereby and that engages with a pin 23 on thebody of the skip. Latch 22 is pivotally mounted to the channel member 1%as at 24 and has a roller 25 thereon which, in operation, engages with atrack 26 to open it. This will be referred to in more detail later. Thechannel members 18 and 19 also have a roller 27 that engages with thetrack 26 for the purpose of opening the door after the latch 22 has beenreleased.

The operating track 26 which is designed in use for engagement by therollers 25 and 27, is curved to slope away from the normal course ofskip travel, as indicated in Figure 1. It will be appreciated that thereis a latch assembly and a roller 27 on each side of the door and thatthere are two tracks 26, one for each side of the door.

In operation, the track 26 is rigidly mounted as indicated in Figure 1so that its lower straight end 28 is engaged by the rollers 25 and 27 asthe mine skip is pulled up the shaft. When roller 25 strikes the curvedportion of the track as at 29, it causes the latch 22 to move in aclockwise direction about its pivot point 24 and to release the door. Asthe skip is raised further, the wheel or roller 27 engages with thesloped portion of the tracks and gives opening power for the door 14.The door in the fully open position is indicated by dotted lines ofFigure 1.

It will be apparent that as the skip is dropped in the shaft afterhaving been fully dumped, that the door will close as the roller 27follows onto the straight portion 28 of the track 26. Subsequently, anddue to a similar ac tion, the latch 22 will be closed on the pin 23.

What I claim as my invention is:

1. In a skip, a body having side walls including a front side wall and aback side wall, a bottom sloping downwardly from said back side walltowards said front side wall, said body having a discharge opening, adoor for said opening hinged at its top to said front side wall,latching means for, said door to keep it closed, said latching meanscomprising a latch member pivotally mounted on said door, and a catch onsaid body for engagement by said latch.

2. In a skip, a body having side walls including a front side wall and aback side wall, a bottom sloping downwardly from said back side walltowards said front side wall, said body having a discharge opening, adoor for said opening hinged at its top to said front side wall,latching means for said door to keep it closed, means for operating saidlatching means from a locked to an unlocked position and means foroperating said door from an open to a closed position, said bottomsloping forwardly of said door when the latter is in a closed positionto form A front view of the inwardly an apron over which muck will passafter the door is opened; said latching means comprising a latch memberpivotally mounted on said door, and a catch on said door for engagementby said latch, and in which said means for operating said latching meanscomprises a catch track rigidly mountable ona mine shaft in which saidskip is operated, catch track engaging. means carried by said latch forengaging said track, said means for operating said door. includes a doortrack, track engaging means carried by said door for engaging said doortrack after said track engaging means carried by said latch, said tracksbeing curved whereby said two track engaging means operate said latchtoopen it and then said door to open said door as said. skip is raised,and then to close said door and subsequently lock said latch as saidskip. is lowered.

3. In a skip, a body having sidewalls including a front side wall andaback side wall, a bottom sloping downwardly from said back side walltowards said front side wall, said body having a discharge opening, adoor for said opening hinged at its top to said front side wall,latching means for said door to keep it closed, means for operating saidlatching means from a locked to an unlocked position and means foroperating said door from an open to a closed position, said bottomsloping forwardly'of said door when the latter is in a closed positionto form an apron over which muck will pass after the door isopened; saidlatching means comprising a latch member pivotally mounted on said door,and a catch on atlases;

said door for engagement by said latch, and in which said means foroperating said latching means comprises a track rigidly, mountable on amine shaft in which said skip is operated, track engaging means carriedby said latch for engaging said track, said means for operating saiddoor includes a track, track engaging means carried by said door forengaging said track after said track engaging rneans carried by saidlatch, said tracks being curved whereby said two track engaging meansoperate said. latch to open. it and then said door to open said door assaid skip is raised, and then to close said door and subsequently locksaid latch as said skip is lowered.

4. In a skip, a body having'side walls including a front side Wall and aback side Wall, a bottom sloping downwardly from said back side walltowards said front side wall, said body having a discharge opening, adoor for said opening hinged at its top to said front side wall,latching means for said door to keep it closed, means for operatingsaidlatching means from a locked to an unlocked position andmeans-independent of said latching means.

References Cited in the file of this patent UNITED STATES PATENTS LepleyJune3, 1924 2,424,620. Kern. July 29, 1947 2,479,449 Woodward et al Aug.16, 1949 2,649,983 Finlay et al Aug. 25, 1953

